AirHint found the following cheapest one-way flights from Seattle (SEA) to Madrid (MAD) in January 2026 (see full year).
One-Way flights
| 04 Jan | Aer Lingus | ||
| 02 Jan | Aer Lingus | ||
| 03 Jan | Lufthansa | ||
| 01 Jan | Lufthansa |
Also check the deals for return flights from Seattle to Madrid in January.
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